Defined Contribution Plan (Details)	3 Months Ended
	Mar. 31, 2018 USD ($) age
Defined Contribution Plan Disclosure [Line Items]
Minimum age of employee to cover under the plan | age	21
Employee compensation deferred percentage	100.00%
Employer match of employee contributions of eligible compensation	100.00%
Percentage of compensation matched by employer	3.00%
Employer match of over all employee contributions of eligible compensation	50.00%
Percentage of employee contribution vested on their contribution	100.00%
Employer matches vesting period	6 years
Amount of discretionary matching contributions on employee deferrals | $	$ 25,000
Maximum
Defined Contribution Plan Disclosure [Line Items]
Percentage of compensation matched by employer	5.00%